Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Stratified or layered articles
Patent
1995-05-19
1997-08-19
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Stratified or layered articles
264122, B29C 4304, B29C 4318
Patent
active
056585110
ABSTRACT:
A method of manufacturing molded parts, preferably having the same wall thickness, from mixtures of cellulose and/or lignocellulose fibers with more than 20% by weight of thermal binders, in which the molded article results from application of heat and pressure to fiber mat prefabricated therefrom. In a first step, the fiber mat undergoes preliminary compression as a planar, endless matted fiber fleece, with only a small degree of compression of the fiber composite, the matted fiber fleece containing at least 2% by weight of a binder which cross-links under heat, its "start-off temperature", i.e. the temperature at which cross-linkage begins, being lower than the softening temperature of the thermoplastic binder. The cellulose and/or lignocellulose fibers are provided, before production of the fiber composite, with a surface finish of the cross-linking binder. The fiber mat, slightly compressed in the first step, is in a second step heated in the form of a blank or of a web to at least the start-off temperature of the fiber finish. Compression is carried out before shaping of the molded article, which is held in this condition of density for the duration of the cross-linkage of the fiber finish. Finally the preferably planar fiber mat, is shaped by the application of pressure to form the finished molded article, in a press tool whose temperature lies below that of the heated fiber mat.
REFERENCES:
patent: 4505869 (1985-03-01), Nishibori
patent: 5064592 (1991-11-01), Ueda et al.
patent: 5391340 (1995-02-01), Mirous et al.
patent: 5480602 (1996-01-01), Nagaich
Lignotock GmbH
Theisen Mary Lynn
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